1 Answer
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There's probably no hard-and-fast rule, but I have two suggestions for abstracts, acknowledgements etc. in different languages.

One possibility is to typeset the respective text components basically as unnumbered chapters or sections (using the highest-ranking heading of your document). As a tweak, you could locally disable the \clearpage command so that multiple abstracts/acknowledegements will not automatically start a new page. (This is inconsistent compared to other chapters, but should make clear that these text components are variants [translations] of the same text.)

Another possibility (but only applicable for two or three languages and fairly short texts) is to typeset the abstracts/acknowledgements inside a multicols environment, separating the different languages by \columnbreak.

In the following minimal example that shows both possibilities, I've used the KOMA-Script class scrreprt and the geometry package in order to fit three abstracts into one page.